Hartree, Douglas R.    1897-1958. <br/><br/>
Calculating instruments and machines /    
D. R. Hartree. 
 - Urbana :   Univ. of Illinois Press,   1949. 
 - ix, 138 p. :    illus. ;    26 cm. 
<br/><br/>Includes bibliographical references (p. 131-134). 
<br/><br/><label>LCCN: </label>49-006378 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculators.--------<br/>Mathematical instruments.--------
<br/><br/><label>Dewey Class. No.: </label>510.78 HAR